-- |Agent Interpreter for X11, Internal
module Helic.Interpreter.AgentX where

import Polysemy.Chronos (ChronosTime)
import qualified Polysemy.Conc as Conc
import Polysemy.Conc (EventConsumer, Events, withAsync_)
import Polysemy.Tagged (Tagged, untag)

import qualified Helic.Data.Event as Event
import Helic.Data.Event (Event (Event))
import Helic.Data.InstanceName (InstanceName)
import Helic.Data.XClipboardEvent (XClipboardEvent (XClipboardEvent))
import Helic.Effect.Agent (Agent (Update), AgentX, agentIdX)
import qualified Helic.Effect.XClipboard as XClipboard
import Helic.Effect.XClipboard (XClipboard)

-- |Listen for 'XClipboardEvent's and publish them as 'Event's.
transformXEvents ::
  Member (Reader InstanceName) r =>
  Members [EventConsumer xr XClipboardEvent, Events er Event, XClipboard, ChronosTime, Resource, Race, Async] r =>
  Sem r a ->
  Sem r a
transformXEvents =
  withAsync_ do
    Conc.subscribeLoop \case
      XClipboardEvent text selection -> do
        XClipboard.sync text selection
        ev <- Event.now agentIdX text
        Conc.publish ev

-- |Interpret 'Agent' using the X11 clipboard as target.
-- This interpreter also runs a thread that converts events generated by the 'XClipboard' interpreter
-- ('XClipboardEvent') to the main 'Event' type.
interpretAgentX ::
  Members [EventConsumer xr XClipboardEvent, Events er Event, Reader InstanceName, XClipboard, ChronosTime] r =>
  Members [Events xr XClipboardEvent, Error Text, Race, Resource, Async, Embed IO, Final IO] r =>
  InterpreterFor (Tagged AgentX Agent) r
interpretAgentX sem =
  transformXEvents $
  interpreting (untag sem) \case
    Update Event {..} ->
      XClipboard.set content